In the place of "Find the sum of all products whose...", I would say: "Find the number of all products whose..." ;-)
Why  instead of 0?
Since I have kludged a solution together, can I have a hint?
this solution works on my comupter
I see the first test command line is corrupted
:( :( :(
I've fixed that first line in the test suite. Try it again.
Select every other element of a vector
Find the stride of the longest skip sequence
Calculate the area of a triangle between three points
Getting the indices from a matrice
Find the path through the cell
Find indices of diagonal elements
Mysterious digits operation (easy)
Negation and new variables
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